Description
- One-touch joints are pipe joints which do not require tools during piping connection.
- Unlike conventional connection methods using union nuts and flanges, controlling tightening torque at connection point is not necessary.
- When removing a pipe joint, use a disconnector.
Exploded View Of One-Touch Joint Components. Scheme 2
IDENTIFICATION
Note. Vehicles with factory installed fluorescent dye have a green label. Vehicles without factory installed fluorescent dye have a blue label.
IDENTIFICATION LABEL FOR VEHICLE
Vehicles with factory installed fluorescent dye have the identification label on the front side of hood.
LUBRICANT RETURN OPERATION
Adjust the lubricant quantity according to the test group shown below.
- CHECK LUBRICANT RETURN OPERATION Can lubricant return operation be performed? A/C system works properly. There is no evidence of a large amount of lubricant leakage. CAUTION: If excessive lubricant leakage is noted, never perform the lubricant return operation. OK or NG OK: GO TO 2. NG: GO TO 3 .
- PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS Start the engine, and set to the following conditions: Engine speed: Idling to 1,200 RPM A/C switch: ON Blower speed: Max. position Temp. control: Optional [Set so that intake air temperature is 25 to 30°C (77 to 86°F).] Intake position: Recirculation (REC) Perform lubricant return operation for about 10 minutes. Stop the engine. : GO TO 3.
- CHECK REPLACEMENT PART Should the compressor be replaced? YES: GO TO " «LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACEMENT»(ref-271537-S19716644282007111400000) ". NO: GO TO " «LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACEMENT EXCEPT COMPRESSOR»(ref-271537-S10667541682007111400000) ".
Description of Air Conditioner LAN Control System
The LAN (Local Area Network) system consists of unified meter and A/C amp., mode door motor, air mix door motor and intake door motor.
A configuration of these components is shown in the figure below.
Wiring Diagram - ATC-A/C-02. Scheme 3
OPERATION
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp. sends mode door, air mix door and intake door opening angle data to the mode door motor LCU, air mix door motor LCU and intake door motor LCU.
The mode door motor, air mix door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of the motor position sensors is compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection data are returned to the unified meter and A/C amp.
Wiring Diagram - ATC-A/C-04. Scheme 4
Description of Control System
The control system consists of input sensors, switches, unified meter and A/C amp. (microcomputer) and outputs. The relationship of these components is shown in the figure below
Identifying Pin Connector Terminal Layout. Scheme 5
Scheme 6
CAN Communication System Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only. For details, refer to " CAN SYSTEM SPECIFICATION CHART ".
The self-diagnosis system diagnoses sensors, door motors, blower motor, etc. by system line.
Self-diagnosis is STEP-1 to 7. There are two ways of changing method during self-diagnosis.
Scheme 7
- Switching to self-diagnosis STEP-1 to 4. Shifting from normal control to the self-diagnosis system is accomplished by starting the engine (turning the ignition switch from OFF to ON) and pressing A/C switch for at least 5 seconds. The A/C switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This system will be canceled by either pressing intake switch or turning the ignition switch OFF. Shifting to the next step is accomplished by means of turning fan control dial, as required.
- Switching to self-diagnosis STEP-5 to 7 (Auxiliary mechanism). Shifting from normal control to the self-diagnosis system is accomplished by starting the engine (turning the ignition switch from OFF to ON) and pressing intake switch for at least 5 seconds. The intake switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This system will be canceled by either pressing A/C switch or turning the ignition switch OFF. Shifting to the next step is accomplished by means of turning fan control dial, as required. (Scheme 6): Self-Diagnosis Procedure Chart
Scheme 8
Scheme 9
Scheme 10
Scheme 11
Scheme 12
Scheme 13
Scheme 14
Scheme 15
- SET IN SELF-DIAGNOSIS MODE (STEP-1 TO 4) Set the fan control dial to OFF position. Turn ignition switch ON. Set in self-diagnosis mode as follows. Within 10 seconds after starting engine (ignition switch is turned ON.), press A/C switch for at least 5 seconds. NOTE: If battery voltage drops below 12 V during diagnosis STEP-3, door motor speed becomes slower and as a result, the system may generate an error even when operation is normal. To avoid this, start engine before performing this diagnosis.: GO TO 2.
- STEP-1: LEDS ARE CHECKED Check intake and A/C switch LEDs illumination. OK: GO TO 3. NG: Refer to " «SELF-DIAGNOSIS»(ref-271537-S29643506062007111400000) ". see scheme 38: Identifying Intake And A/C Switch LED
- CHECK TO ADVANCE SELF-DIAGNOSIS STEP-2 Turn fan control dial to AUTO position. see scheme 39: Identifying A/C Switch LED And Self-Diagnosis Step 2 NOTE: When switched to STEP-2, LED of REC position blinks for approximately 25 seconds. Check A/C switch LED illumination. Advance to self-diagnosis STEP-2? YES: GO TO 4. NO: Replace A/C controller. (Fan control dial is malfunctioning.)
- CHECK TO RETURN SELF-DIAGNOSIS STEP-1 Turn fan control dial to OFF position. Return to self-diagnosis STEP-1? YES: GO TO 5. NO: Replace A/C controller. (Fan control dial is malfunctioning.)
- STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT Turn fan control dial to AUTO position. Turn mode control dial to AUTO position. NOTE: When switched to STEP-2, LED of REC position blinks for approximately 25 seconds. Check A/C switch LED is illuminate. OK or NG OK: GO TO 6. NG: GO TO 9. see scheme 40: Identifying A/C Switch LED
- STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED Turn fan control dial to 1st - 12th speed. NOTE: When switched to STEP-3, LED of REC position blinks for approximately 50 seconds. Check A/C switch LED is illuminate. see scheme 41: Identifying A/C Switch LED And Self-Diagnosis Step 3 OK or NG OK: GO TO 7. NG: GO TO 10.
- STEP-4: OPERATION OF EACH ACTUATOR IS CHECKED Turn fan control dial to 13th - 25th speed. Change operation status of air conditioner by changing mode control dial position.: GO TO 8. see scheme 42: Identifying Self-Diagnosis Step 4
- CHECK ACTUATORS Refer to the following chart and confirm discharge air flow, air temperature, blower motor duty ratio and compressor operation. see scheme 43: Discharging Air Flow Table MODE DOOR POSITION AND BLOWER MOTOR DUTY RATIO REFERENCE STEP-No. (1) STEP-41 STEP-42 STEP-43 STEP-44 STEP-45 STEP-46 Mode control dial position AUTO VENT B/L FOOT or FOOT2 D/F or D/F2 DEF Mode door position VENT VENT2 B/L FOOT (2) D/F DEF Intake door position REC REC REC FRE FRE FRE Air mix door position FULL COLD FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT Blower motor duty ratio 25% 25% 41% 57% 75% 91% Compressor ON ON OFF OFF ON ON (1) STEP-No. 41 to 46 are for differentiation and will not be displayed. (2) FOOT position during automatic control. Refer to " «AUXILIARY MECHANISM: FOOT POSITION SETTING TRIMMER»(ref-271537-S25133880972007111400000) " Checks must be made visually, by listening the sound, or by touching air outlets with hand, etc. for improper operation. OK or NG OK: Turn ignition switch OFF or intake switch ON. INSPECTION END NG: Air outlet does not change. Go to " «MODE DOOR MOTOR CIRCUIT»(ref-271537-S01730519882007111400000) ". Intake door does not change. Go to " «INTAKE DOOR MOTOR CIRCUIT»(ref-271537-S42932004292007111400000) ". Discharge air temperature does not change. Go to " «AIR MIX DOOR MOTOR CIRCUIT»(ref-271537-S00473848672007111400000) ". Blower motor operation is malfunctioning. Go to " «BLOWER MOTOR CIRCUIT»(ref-271537-S28922627112007111400000) ". Magnet clutch does not engage. Go to " «MAGNET CLUTCH CIRCUIT»(ref-271537-S28597228912007111400000) ".
- CHECK MALFUNCTIONING SENSOR AND DOOR MOTOR Refer to the following chart. *1: Perform self-diagnosis STEP-2 under sunshine. When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise LED of A/C switch will not indicate despite that sunload sensor is functioning properly. NOTE: When switched to STEP-2, LED of REC position blinks for approximately 25 seconds. see scheme 44: Identifying A/C Switch LED MALFUNCTIONING SENSOR AND DOOR MOTOR INSPECTION CHART Mode control dial position Unusual Malfunctioning sensor and door motor (Including circuits) Reference page VENT A/C LED: OFF Ambient sensor (1) B/L In-vehicle sensor (2) FOOT or FOOT2 Sunload sensor *1 (3) D/F or D/F2 Intake sensor (4) DEF Air mix door motor (LCU) PBR (5) (1) " «DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR»(ref-271537-S28572802462007111400000) ". (2) " «DIAGNOSIS PROCEDURE FOR IN-VEHICLE SENSOR»(ref-271537-S33409018362007111400000) ". (3) " «DIAGNOSIS PROCEDURE FOR SUNLOAD SENSOR»(ref-271537-S02880059522007111400000) ". (4) " «DIAGNOSIS PROCEDURE FOR INTAKE SENSOR»(ref-271537-S29049604762007111400000) ". (5) " «DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR»(ref-271537-S15485309242007111400000) ".: INSPECTION END
- CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH Mode and/or intake door motor PBR(s) is/are malfunctioning. NOTE: When switched to STEP-3, LED of REC position blinks for approximately 50 seconds. MALFUNCTIONING DOOR MOTOR POSITION SWITCH INSPECTION CHART Unusual Mode or intake door position Reference page REC LED: ON Mode door motor (1) FRE LED: ON Intake door motor (2) (1) " «DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR»(ref-271537-S22067477822007111400000) ". (2) " «DIAGNOSIS PROCEDURE FOR INTAKE DOOR MOTOR»(ref-271537-S35168380002007111400000) ".: INSPECTION END see scheme 45: Identifying LED
Operational Check
The purpose of the operational check is to check if the individual system operates properly.
Conditions: Engine running at normal operating temperature
System Operation
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp. sends air mix door, mode door and intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of the motor position sensors are compared by the LCUs in each door motor with the existing decision and opening angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection data are returned to the unified meter and A/C amp.
Scheme 16
Scheme 17
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp. sends air mix door, mode door and intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of the motor position sensors are compared by the LCUs in each door motor with the existing decision and opening angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection data are returned to the unified meter and A/C amp.
Air Mix Door Motor Circuit - Operation Diagram. Scheme 18
Air Mix Door Opening Angle Graph. Scheme 19
The intake door control determines intake door position based on the ambient temperature, the intake air temperature and the in-vehicle temperature. When setting mode control dial to D/F, D/F2 or DEF position, fan control dial OFF position, the unified meter and A/C amp. sets the intake door at the FRE position.
Magnet Clutch - Circuit Diagram. Scheme 20
Scheme 21
SYSTEM DESCRIPTION
Unified meter and A/C amp. controls compressor operation by ambient temperature, intake air temperature and signal from ECM.
COMPONENT DESCRIPTION
The sunload sensor is located on the passenger's side defroster grille. It detects sunload entering through windshield by means of a photo diode. The sensor converts the sunload into a current value which is then input into the unified meter and A/C amp.
